ect tween them particularly until the -blow had been difficult. In order to over- come this diffewpy, Capt. repeated for the sixth time. Cast iron sleepers Lindmark, of the"*8wedish: Fig. 1—TUNNELING BY FREEZING. are expected to withstand Engineers, proposed to. a similar test up to 7 feet tunnel… … Mr. Lindmark, in the first place, thought of the lated, and at last ran over the top of the bank in Fig. 3. method devised by the Austrian engineer Rziha, which places. Wherever this happened, a breach in the em- bankment was invariably caused. Someof the smaller two centerings, one consisting of…
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